R8C datasheet(27/199 Pages) RENESAS

27 / 199 page

R8C/10 Group

Rev.1.20 Jan 27, 2006

page 17 of 180

REJ09B0019-0120

• CPU clock source

• Peripheral function clock source

Use of clock

Main clock

oscillation circuit

Item

Clock frequency

0 to 16 MHz

• Ceramic resonator

• Crystal oscillator

Usable oscillator

XIN, XOUT(1)

Pins to connect

oscillator

Present

Stopped

Oscillator status

after reset

Externally derived

clock can be input

Other

On-chip oscillator

• CPU clock source

• Peripheral function clock source

• CPU and peripheral function

clock sources when the main

clock stops oscillating

About 125 kHz

Present

Oscillating

NOTES:

1. Can be used as P46 and P47 when the on-chip oscillator clock is used for CPU clock

while the main clock oscillation circuit is not used.

• CPU and peripheral function

clock sources when the

main clock stops oscillating

(Note 1)

Oscillation starts

and stops

6. Clock Generation Circuit

The clock generation circuit contains two oscillator circuits as follows:

• Main clock oscillation circuit

• On-chip oscillator (with oscillation stop detection function)

Table 6.1 lists the clock generation circuit specifications. Figure 6.1 shows the clock generation circuit.

Figures 6.2 and 6.3 show the clock-related registers.

Table 6.1 Clock Generation Circuit Specifications

6. Clock Generation Circuit

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